Good morning Vacallum85. From other posts that I have read, there are no model specific manuals for the travel trailers. There is a general manual posted for 1986 to 1990 trailers. I downloaded this one for my 1987. It has helped, along with information from various members and threads.
Sunline Coach Owner's Club - Sunline Owner's Files - Sunline Owners Manuals
If you are looking for information on your appliances, search by the appliance model number or you can post the model number and one of the other members may have it in their trailer and can help you out. I was fortunate enough that the previous owner still had the binder with some info on the appliances. I may have some of what you have since we both have the same year. I am in the process of making digital copies. Post what you are looking for and I can take a look. I have some time this morning.